Cite. Sources: Selenium occurs in the minerals crooksite and clausthalite. Element number 34, selenium, was discovered by Swedish chemist Jons Jacob Berzelius in 1817. Selenium has antioxidant properties and may help protect cells from damage. Join Yahoo Answers and get 100 points today. The term has particular application to cadmium, mercury and lead, all of which appear in the World Health Organization's list of 10 chemicals of major public concern. A toxic heavy metal is any relatively dense metal or metalloid that is noted for its potential toxicity, especially in environmental contexts. Selenium is one of the "essential" nutrients for humans, meaning that our bodies cannot make it, and so we have to get it from our diet. Subsequently, selenium and various selenium compounds have been used in a variety of photoconductor and photovoltaic applications. This native selenium is exactly as it came out of the ground. The role of selenium in health was first recognized as a toxic one, by the recognition of its adverse effects. Is Selenium A Metal. Selenium was first discovered by Jöns Jacob Berzelius in 1817. It has been prepared from flue dusts from processing copper sulfide ores, but the anode metal from electrolytic copper refineries is a more common source of selenium. Selenium chemistry is predominantly nonmetallic, but the position of this element in the period confers on it increasing metallic properties. Selenium can come in … At room temperature selenium is a solid, but not a metal. Selenium occurs in (fairly) pure form in nature. It is used in many light-sensing applications: photocopiers, automatic light switches and light meters. Read about company. Selenium is also used as an additive to stainless steel. Find here Selenium Metal, Se Metal manufacturers, suppliers & exporters in India. Here, we report a new baked‐in‐salt approach to enable Se to better infiltrate into metal‐complex‐derived porous carbon (Se/MnMC‐B). [1] Selenium is generally found in the earth’s crust, and the metal-reducing bioentities are pervasive in the environment [12–15]. Most people get enough of this essential mineral from foods, and taking too much may lead to health problems. A metal rectifier is an early type of semiconductor rectifier in which the semiconductor is copper oxide or selenium.They were used in power applications to convert alternating current to direct current in devices such as radios and battery chargers. 0 0. shaheen. Often, it’s found in metal sulfite ores (fancy word for rocks that have high amounts of extractable minerals), which often replaces sulphur. They are called allotropes.The most stable of these is a dense gray semimetal (an element that is partially a metal and a nonmetal).The way the atoms are put together is a named a trigonal polymer chain.It lets electricity pass through it better in the light than in the dark. it says, "Suggest wheather selenium is a metal or a non-metal", which i can answer Non-metal, Then.. "Explain your Decision" And i'm stuck there becuase all i did was look on wiki pedia and sore its a non-metel but i dont know why it is????? Source(s): https://shrink.im/a9AFZ. In a survey of 194 lists of metalloids (here: Lists of metalloids - Wikipedia), selenium appeared 46 times giving a frequency of 24%. Imports of selenium (includes unwrought metal, waste and scrap, and compounds) 412 Exports of selenium (includes unwrought metal and waste and scrap) 160 Fabrication Processing losses Selenium products to U.S. market 350 New prompt scrap generated <½ Domestic production of selenium materials W Old scrap generated Old scrap supply The selenium content in manganese metal produced using the selenium technology can be as high as 0.15%. Although selenium has a metallic luster, it is not metallic in crystal structure or bonding characteristics. Selenium Metal is available as disc, granules, ingot, pellets, pieces, powder, rod, wire, and sputtering target. Still have questions? State environmental regulators Friday approved new standards for a heavy metal in Lake Koocanusa and the Kootenai River. Ask Question + 100. Ultra high purity and high purity forms also include metal powder, submicron powder and nanoscale, quantum dots, targets for thin film deposition, pellets for evaporation and single crystal or polycrystalline forms. Its bonds are more covalent in nature and its structure is more spread out than in metallic minerals such as copper and iron. Selenium is considered a nonmetal, even though it’s similar to magnesium in so many ways. Selenium is an essential trace mineral that is mainly derived from soil, water, and plant materials. 0 0. For a certain period of time, the selenium rectifier enjoyed popularity as perhaps the most widely used rectifier. Selenium is also very important for healthy fertility. 26th Apr, 2019. 0 0. If it wasn’t clear in the intro, selenium is a mineral. It’s a strange mineral because it is almost never found in its natural form. It is a non-metal with properties that are intermediate between the chalcogen elements sulfur and tellurium. Inorganica Chimica Acta, 92 (1984) 187-189 Selenium Detoxification of Heavy Metals: a Possible Mechanism for the Blood Plasma KERN L. NUTTALL and FRITZ S. ALLEN* Department of Chemistry, University of New Mexico, Albuquerque, N.M. 87131, U.SA. Selenium exerts its biological functions through selenoproteins. It shows borderline metalloid or nonmetal behaviour. Tellurium is more metallic in nature than selenium but is still a semi-metal. Selenium is one of the essential minerals, and we need to obtain these nutrients from our diet.. 58 Consequently, one of its most apparent characteristics is its ‘schizophrenic personality’, and it behaves as a nonmetallic nonmetal and as a nonmetallic metal. The substitution of Se for S as cathode for rechargeable batteries, which confine selenium in porous carbon, attracts much attention as a potential area of research for energy storage systems. This is especially important for reducing cancer growth and improving the aging process (10, 11, 12). Selenium (selenium atoms only) has several different forms. For lithium‐selenium batteries, commercial applications are hindered by the inferior electrical conductivity of selenium and the low utilization ratio of the active selenium. 9 years ago. Of course non-metal. British diets are very low in minerals and antioxidants, in particular selenium. Selenium is a non-metal and can be compared chemically to its other non-metal … thank you Alma but some books put selenium with the metalloid . Trending Questions. The Agency for Toxic Substances and Disease Registry assigned selenium a “minimal” risk level. Montana Board of Environmental Review Chair Chris Deveny says the proposed regulations were approved in a five to one vote. But magnesium is a metal, the lightest of all metals actually. Received December 20, 1983 Among the activities of the essential trace element selenium is the ability to reduce the toxicity of heavy metal … Silicon rectifiers eventually took over this title.. Selenium rectifiers can be used for electronic devices, such as photocopiers. Due to its photoelectric and semiconducting nature, free radical scavenging ability, and anti-cancer and anti-oxidative properties, … Nextgen Steel & Alloys - Offering Selenium Metal, Se Metal, सेलेनियम मेटल at Rs 6000/kilogram in Mumbai, Maharashtra. Bismuth / Selenium / Tellurium top stories more... Data: SHFE, DCE market movement (Nov 13) ... Social inventories of silicon metal across Huangpu port, Kunming city and Tianjin port remained unchanged from the previous week at 71,000 mt as … Selenium is compared to a mechanic in that it attaches protective anti-oxidants such as glutathione on damaged areas of DNA. Get contact details and address| ID: 12518017391 To date, there are no reports about metal–organic frameworks (MOFs) to use for Na–Se batteries. Selenium is usually excreted from the body naturally within 24 hours, although rare exceptions do occur. This process helps to reduce and repair damaged cell DNA. Thus, selenium is usually counted as a nonmetal. Selenium toxicity is generally not a widespread threat to humans. Join. HELP! Hydrogen selenide and other selenium compounds are toxic Elemental selenium is practically non-toxic and is considered to be an essential trace element; however, hydrogen selenide and other selenium compounds are extremely toxic, and resemble arsenic in their physiological reactions. Marcin. In fact, selenium deficiency is far more common than selenium toxicity. While selenium is not a metallic element, gray selenium is a good photoconductor, and was used in early photocells. Selenium is an essential micronutrient in mammals, but is also recognized as toxic in excess. Get your answers by asking now. Humans mainly acquire it from various plant sources, and since it is required for several essential activities, it is considered a non-metal. The amount of selenium in food depends on the selenium concentration of the soil, and this can vary both regionally and internationally ().Sadly, selenium deficiency is a growing problem, and estimates put the global number of selenium-deficient people at one billion (2, 3). A selenium rectifier is a type of rectifier that uses selenium, a chemical element that is not a metal, as a semiconductor for electrical conductivity. Selenium (Se) is a nonmetal, germanium (Ge) is a metalloid, and silver (Ag) is a metal.? Trending Questions. Coincidentally, research on trace elements and antioxidants has shown that these elements, and in particular selenium, are of great importance for the optimum functioning of the immune system and the body's resistance to heavy metal pollution. Which of the following lists the elements in probable order from least malleable to … Scroll down to see examples of Selenium. This is a question i'm stuck on in my science h/w. The limits are aimed at stemming selenium leaching from coal mines along British Columbia’s Elk River. nonmetal. Get contact details & address of companies manufacturing and supplying Selenium Metal, Se Metal across India. Properties Physical properties. Selenium is important if you take a cholesterol medication, and I’ll get to that shortly. Selenium is in the gaseous odor you smell when an unhappy skunk is nearby, said Simson. Although toxic in large quantities, it is necessary for certain cellular functions of animals and people. ... Selenium has the characteristics of non-metals and metals evenly divided, being a metalloid or semi-metal. 9 years ago. A non-metal with properties that are intermediate between the chalcogen elements sulfur and tellurium in. Lithium‐Selenium batteries, commercial applications are hindered by the inferior electrical conductivity of selenium and various selenium compounds have used... 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